DIRECTIONS:
De-stem the mushrooms and finely chop the stems (leaving the caps intact.
Sautee the chopped mushroom stems, onions and garlic until the onions are transparent, about 5 minutes.
Remove the mushroom mixture from the heat.
Add salt, egg, and mix well.
Fill the mushroom caps with the egg mixture and place in a frying pan.
Cook, covered, on low-medium heat for 10 minutes, or until the egg is no longer runny.
Serve with warm marinara sauce.